JPS63243241A - High strength copper alloy having high electroconductivity, heat resistance and bending resistance - Google Patents

Abstract

PURPOSE:To obtain a high electroconductive heat-resistant copper alloy having excellent repeated bending strength and tensile strength by respectively incorporating specific amounts of Mg, P and one kind among In, Sn, Pb and Sb into the alloy. CONSTITUTION:The copper alloy contains, by weight, 0.02-0.5% Mg, 35-100% P for Mg, 0.01-0.8% Zr, one kind among 0.01-0.5% In, Sn, Pb and Sb and the balance consisting of Cu. Said copper alloy is suitable as the conductor of an electrical wire for wiring in a prior electronic equipment and as the conductor of a cable for an industrial robot. The titled alloy furthermore has the capacity which is effectively usable at the time of using the alloy as about 0.3-0.01mmphi thin diameter conductor accompanied by the miniaturization of an electronic equipment and as a cable for the robot which operates repeatedly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has high conductivity suitable for use as a conductor for wiring in electronic devices and a conductor for cables for industrial robots, and also has high tensile strength and Concerning a copper alloy with excellent bending resistance.

Copper alloys that exhibit excellent mechanical properties such as electrical conductivity and tensile strength over a wide temperature range have been known, for example, copper alloys that contain magnesium and phosphorus in specific amounts (Japanese Patent Publication No. 49 -10894).

In addition, zirconium is used as a highly conductive and heat-resistant copper alloy.
Copper alloys containing 0.01 to 0.15% by weight have also been produced.

In recent years, with the development of electronic devices, they have become increasingly lighter, thinner, and shorter, and as a result, the conductors for wiring in electronic devices are also becoming smaller in diameter. For example, in the copper alloy containing Mg and P according to the above-mentioned Japanese Patent Publication No. 49-10894, when the conductor has a small diameter of about 0.3-φ to 0.01++nφ, it is difficult to manufacture electronic equipment. It cannot maintain sufficient strength against the heat applied during the process.

That is, since the heat resistance is not sufficient, the parts that are sometimes heated during brazing become mechanical weak points and are prone to wire breakage. Furthermore, the above-mentioned zirconium copper has a drawback that it is prone to breakage at terminal crimping connection points of the conductor because it lacks repeated bending strength. Incidentally, in this case, even if an attempt is made to increase the strength by increasing the zirconium content, the content will vary, making it impossible to obtain an alloy of stable quality.

Furthermore, since industrial robots repeatedly operate up to the taught position, the robot cable conductors used in these robots are constantly subjected to repeated bending and tension, making them susceptible to wire breakage. In addition,
Cable conductors for industrial robots used in high-temperature environments are subjected to repeated bending and tension under heating.

Therefore, under such conditions, the cyclic bending strength and tensile strength of the conductor are significantly reduced.

Due to the use of these conductors under harsh conditions, such as small-diameter conductors for wiring in electronic equipment and cable conductors for industrial robots, these conductors are not as good as conventional ones with excellent heat resistance. In addition to good electrical conductivity, there is a need to provide conductors that have improved cyclic bending strength and tensile strength.

The present invention was developed in view of the situation on the ridge, and is suitable for use in small-diameter conductors for wiring in various miniaturized electronic devices and for industrial robots used in high-temperature atmospheres. It is an object of the present invention to provide a highly conductive, heat-resistant copper alloy that exhibits excellent cyclic bending strength and tensile strength and can be effectively used as a cable conductor.

The present invention will be explained in detail below.

The characteristics of the present invention are that magnesium is 0.02 to 0.5% by weight, phosphorus is 35 to 100% by weight relative to magnesium,
Contains 0.01 to 0.8% by weight of zirconium and 0.01 to 0.5% by weight of one selected from the group consisting of indium, tin, lead and antimony, with the balance essentially consisting of copper. In copper alloy.

The highly conductive copper alloy according to the present invention for the purpose of this invention is produced by adding 0.0 hg to electrolytic copper as a base material, mainly to increase its mechanical strength.
2 to 0.5% by weight, P to 35 to 100% by weight relative to Mg to further increase its strength, 0.01 to 0.8% by weight of Zr to improve conductivity, and In. S
0.01 to 0.5% by weight of one of n, Pb, and sb is added in order to improve tensile strength and repeated bending strength.

The basis for adding each of the above elements in the above specific ranges is based on the following reasons.

Regarding Mg, if the amount added exceeds 0.5% by weight, the conductivity of the resulting copper alloy will decrease significantly1, and in addition, it is difficult to control the Mg content in the copper alloy.
The quality of the copper alloy becomes unstable, and on the other hand, if it is less than 0.02% by weight, the effect of improving cyclic bending strength and tensile strength will be reduced. Regarding P, if the amount added is less than the lower limit of the specific range, the effect of adding P will not be exhibited, while if it exceeds the upper limit, the conductivity of the copper alloy will be impaired. Regarding Zr, if the amount added is less than 0.01% by weight, the repeated bending strength and heat resistance will not be sufficient, and if it exceeds 0.8% by weight, the content will fluctuate greatly, causing problems in terms of quality, and The decrease in electrical conductivity is also significant.

Next, regarding the amount of In, Sn, Pb, or sb added, if the amount added is less than 0.01% by weight, the tensile strength and cyclic bending strength will not be improved, while if it exceeds 0.5% by weight, the copper alloy will deteriorate. It becomes impossible to maintain high conductivity.

According to the present invention, Mg is 0.02-0.5% by weight, P is 35-100% by weight with respect to Mg, Z weight is 0.01-0.
．． 8% by weight and 0.0 In, Sn, Pb or sb
Table 1 shows the results of measuring the R conductivity, tensile strength, elongation, and bending strength of the copper alloy containing 1 to 0.5% by weight using conventional methods.

For comparison, Table 1 also shows the results of similar measurements for copper alloys containing the above-mentioned elements in amounts outside the above-mentioned ranges.

As shown in Table 1, the copper alloy with the composition according to the present invention has good average properties in all of the above physical properties, while the comparative examples outside the composition range of the present invention are poor in one of the physical properties. It is recognized that

Therefore, the copper alloy according to the present invention is not only suitable as a conductor for conventional wiring wires in electronic equipment or as a conductor for cables for industrial robots, but also as a conductor for cables for industrial robots.
It has the ability to effectively utilize a thin wire with a diameter of about 3 mm to 0.01 m-φ as a conductor and as a cable conductor for robots that perform repetitive operations.

The present invention will be specifically explained below with reference to Examples.

Example Electrolytic copper was melted in an argon atmosphere in a high frequency melting furnace, and Mg)! c0.3% by weight, P 0.26% by weight,
Each mother alloy of Cu-Mg5Cu-P and Cu-Zr and In metal were added so that the composition was 0.24% by weight of Zr and 0.11% by weight of In, and 15+a+angle
An ingot with a length of 00+++s+ was produced. After the obtained ingot was placed and cracked, it was hot rolled at 850°C to form a 6111Iφ wire, and solution treatment was performed at 850°C for 1 hour. Next, the wire treated as described above was further cold drawn to 0.08+mφ and annealed at 400°C for 1 hour to form a Cu-Mg-P-
A Zr-In copper alloy was obtained.

The tensile strength, elongation, electrical conductivity, and repeated bending strength of the obtained copper alloy were measured by conventional methods.

The results are as follows.

Claims (1)

[Claims] Magnesium: 0.02-0.5% by weight, phosphorus: 35-100% by weight relative to magnesium, zirconium: 0%
．． 01 to 0.8% by weight and 0.0% of one selected from the group consisting of indium, tin, lead and antimony.
A highly conductive, heat-resistant, bendable, high-strength copper alloy containing 1 to 0.5% by weight, with the remainder consisting essentially of copper.